I've drawn a few ideas from this chart that someone did on DeviantArt, but not so much the Immobilizer. For that I put an octagonal figure at the top (and as a bonus I can add that figure to other pieces to create immobilizing versions).
As for the gorgon here, I agree with Jean-Louis; the pose and the base both say "figurine" rather than "chess piece."
I've drawn a few ideas from this chart that someone did on DeviantArt, but not so much the Immobilizer. For that I put an octagonal figure at the top (and as a bonus I can add that figure to other pieces to create immobilizing versions).
As for the gorgon here, I agree with Jean-Louis; the pose and the base both say "figurine" rather than "chess piece."